PBDB Timescale

International Chronostratigraphic Timescale

The interval definitions in this timescale are derived from the following sources:

K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2023. The ICS International Chronostratigraphic Chart v2023/09. view
F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
W. B. Harland, R. L. Armstrong, A. V. Cox, L. E. Craig, A. G. Smith and D. G. Smith. 1990. A Geologic Time Scale 1989. view
J. I. Raine, A. G. Beu, A. F. Boyes, H. J. Campbell, R. A. Cooper, J. S. Crampton, M. P. Crundwell, C. J. Hollis, and H. E. G. Morgans. 2015. Revised Calibration of the New Zealand Geological Timescale: NZGT2015/1. GNS Science Report 2012(39) view
F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view
J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 view
A. D. Barnosky, M. Holmes, R. Kirchholtes, E. Lindsey, K.C. Maguire, A.W. Poust, M.A. Stegner, J. Sunseri, B. Swartz, J. Swift, N.A. Villavicencio and G. Wogan. 2014. Prelude to the Anthropocene: Two new North American Land Mammal Ages (NALMAs). The Anthropocene Review I(3):225-242 view

There are 59 timescales which overlap this one. show

Interval boundaries marked with * have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.

Interval names marked with † are no longer in current use.

This timescale is used in the definition of 127083 collections

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International Chronostratigraphic Timescale					Ordovician of China			Devonian Subages	Obsolete Precambrian Ages		Permian-Jurassic of New Zealand		Ordovician of the Baltic				Obsolete Names for ICS Units		Mesozoic Subages		Ten Million Year Bins	North American Land Mammal Ages
Phanerozoic	Cenozoic	Quaternary	Holocene	Meghalayan																	Cenozoic 6	Saintaugustinean	0
				Meghalayan																		Santarosean	0.0004
				Northgrippian																			0.0042
				Greenlandian																			0.0082
			Pleistocene	Late Pleistocene																			0.0117
				Late Pleistocene																		Rancholabrean	0.014
				Chibanian																		Rancholabrean	0.129
				Chibanian																		Irvingtonian	0.21
				Calabrian																		Irvingtonian	0.774
				Calabrian																		Blancan	1.4
				Gelasian																			1.8
		Neogene	Pliocene	Piacenzian													Tertiary †						2.58
				Zanclean																			3.6
				Zanclean																		Hemphillian	4.7
			Miocene	Messinian																			5.333
				Tortonian																			7.246
				Tortonian																		Clarendonian	9.4
				Serravallian																	Cenozoic 5	Clarendonian	11.63
				Serravallian																		Barstovian	12.5
				Langhian																			13.82
				Burdigalian																			15.98
																						Hemingfordian	16.3
																						Arikareean	18.5
				Aquitanian																			20.44
		Paleogene	Oligocene	Chattian																	Cenozoic 4		23.03
				Rupelian																			27.82
																						Whitneyan	29.5
																						Orellan	31.8
			Eocene	Priabonian																	Cenozoic 3	Chadronian	33.9
				Priabonian																		Duchesnean	37
				Bartonian																		Duchesnean	37.71
				Bartonian																		Uintan	39.7
				Lutetian																	Cenozoic 2	Uintan	41.2
				Lutetian																		Bridgerian	46.2
				Ypresian																		Bridgerian	47.8
																						Wasatchian	50.5
																						Clarkforkian	54.9
			Paleocene	Thanetian																	Cenozoic 1	Clarkforkian	56
				Thanetian																		Tiffanian	56.2
				Selandian																		Tiffanian	59.2
				Selandian																		Torrejonian	60.9
				Danian																		Torrejonian	61.6
				Danian																		Puercan	63.8
	Mesozoic	Cretaceous	Late Cretaceous	Maastrichtian															Late Maastrichtian/Early Maastrichtian		Cretaceous 8		66
				Campanian															Late Campanian/Middle Campanian/Early Campanian		Cretaceous 7		72.1
				Santonian															Late Santonian/Middle Santonian/Early Santonian		Cretaceous 6		83.6
				Coniacian															Late Coniacian/Middle Coniacian/Early Coniacian				86.3
				Turonian															Late Turonian/Middle Turonian/Early Turonian				89.8
				Cenomanian															Late Cenomanian/Middle Cenomanian/Early Cenomanian		Cretaceous 5		93.9
			Early Cretaceous	Albian															Late Albian		Cretaceous 4		100.5
																			Middle Albian				106.2 *
																			Early Albian				109.9 *
				Aptian															Late Aptian		Cretaceous 3		113
				Aptian															Early Aptian		Cretaceous 3		119.5 *
				Barremian															Late Barremian/Early Barremian		Cretaceous 2		121.4
				Hauterivian															Late Hauterivian/Early Hauterivian		Cretaceous 2		125.77
				Valanginian															Late Valanginian/Early Valanginian		Cretaceous 1		132.6
				Berriasian															Late Berriasian				139.8
																			Middle Berriasian				140.6 *
																			Early Berriasian				142.7 *
		Jurassic	Late Jurassic	Tithonian							Oteke	Puaroan							Late Tithonian	Middle Tithonian	Jurassic 6		145
				Tithonian															Early Tithonian	Middle Tithonian	Jurassic 6		146.3 *
				Kimmeridgian															Late Kimmeridgian		Jurassic 5		149.2
											Kawhia	Ohauan							Late Kimmeridgian				150
Early Kimmeridgian					152.2 *							Ohauan
Early Kimmeridgian					Heterian	154.5
Oxfordian				Late Oxfordian		Middle Oxfordian/Early Oxfordian	154.8
Oxfordian						Middle Oxfordian/Early Oxfordian	157.9 *
Middle Jurassic			Callovian	Late Callovian/Middle Callovian/Early Callovian			161.5
			Callovian	Late Callovian/Middle Callovian/Early Callovian	Temaikan		164.3
			Bathonian	Late Bathonian/Middle Bathonian/Early Bathonian			Jurassic 4	165.3
			Bajocian	Late Bajocian				168.2
			Bajocian	Early Bajocian				168.6 *
			Aalenian	Late Aalenian/Middle Aalenian/Early Aalenian			Jurassic 3	170.9
Early Jurassic			Toarcian	Late Toarcian				174.7
				Late Toarcian	Herangi			Ururoan	176
				Middle Toarcian					180.4 *
				Early Toarcian					182.9 *
			Pliensbachian	Late Pliensbachian/Early Pliensbachian			Jurassic 2		184.2
			Pliensbachian	Late Pliensbachian/Early Pliensbachian			Jurassic 2	Aratauran	188.9
			Sinemurian	Late Sinemurian/Early Sinemurian			Jurassic 1		192.9
			Hettangian	Late Hettangian/Middle Hettangian/Early Hettangian			Jurassic 1		199.5
Triassic		Late Triassic	Rhaetian	Balfour	Otapirian			Triassic 4	201.4
			Norian		Warepan		Sevatian		208.5
							Alaunian		213.2 *
							Lacian		216.7 *
					Otamitan				217
					Oretian				221
			Carnian		Oretian		Tuvalian	Triassic 3	227
				Gore	Kaihikuan		Tuvalian		227.5
							Julian		233.4 *
		Middle Triassic	Ladinian				Longobardian	Triassic 2	237
					Etalian		Longobardian		238
							Fassanian		239.7 *
			Anisian				Illyrian		242
							Pelsonian		243.8 *
							Bithynian		244.7 *
							Aegean		245.5 *
					Malakovian		Aegean		246
		Early Triassic	Olenekian				Spathian	Triassic 1	247.2
							Smithian		248.9 *
					Nelsonian		Smithian		249
			Induan				Dienerian		251.2
							Griesbachian		251.4 *
				DUrville	Makarewan		Griesbachian		251.5
Paleozoic	Permian	Lopingian	Changhsingian		Makarewan			Permian 4	251.902
			Changhsingian		Waiitian				253.2
			Wuchiapingian		Waiitian				Longtanian †	254.14
			Wuchiapingian		Puruhauan				Longtanian †	254.2
		Guadalupian	Capitanian	Aparima	Flettian					259.51
			Wordian		Flettian					264.28
			Wordian		Barettian					266
			Roadian					Permian 3		266.9
		Cisuralian	Kungurian					Permian 2		273.01
			Kungurian		Mangapirian					276
			Artinskian		Mangapirian					283.5
					Telfordian					285
										288.5
			Sakmarian							290.1
			Asselian					Permian 1		293.52
	Carboniferous	Pennsylvanian	Gzhelian					Carboniferous 5		298.9
			Kasimovian					Carboniferous 5		303.7
			Moscovian					Carboniferous 4		307
			Bashkirian					Carboniferous 4		315.2
		Mississippian	Serpukhovian					Carboniferous 3		323.2
			Visean					Carboniferous 2		330.9
			Tournaisian					Carboniferous 1		346.7
	Devonian	Late Devonian	Famennian					Late Famennian		Wocklum/Dasberg/Hemberg/Nehden	Devonian 5	358.9
								Middle Famennian				365.3 *
								Early Famennian				368.5 *
			Frasnian					Late Frasnian		Adorf	Devonian 4	372.2
								Middle Frasnian				375.4 *
						Early Frasnian		379.3 *
		Middle Devonian	Givetian			Late Givetian		Givetian		Devonian 3	382.7
						Middle Givetian					383.7 *
						Early Givetian					385.9 *
			Eifelian			Late Eifelian		Eifelian			387.7
			Eifelian			Early Eifelian		Eifelian			390.3 *
		Early Devonian	Emsian			Late Emsian		Emsian		Devonian 2	393.3
			Emsian			Early Emsian		Emsian		Devonian 2	398.3 *
			Pragian			Pragian		Siegen		Devonian 1	407.6
			Lochkovian			Late Lochkovian		Gedinnine			410.8
						Middle Lochkovian					412.8 *
						Early Lochkovian					415.6 *
	Silurian	Pridoli								Silurian 2	419.2
		Ludlow	Ludfordian								423
		Ludlow	Gorstian								425.6
		Wenlock	Homerian								427.4
		Wenlock	Sheinwoodian								430.5
		Llandovery	Telychian							Silurian 1	433.4
			Aeronian								438.5
			Rhuddanian								440.8
	Ordovician	Late Ordovician	Hirnantian							Hirnantian	Xiaoxita †/Shikou	Wufeng †	Harju	Porkuni	Ordovician 5	443.8
			Katian							Chientangkiangian		Wufeng †		Pirgu		445.2
										Neichianshanian/Hanjiang				Pirgu		449.5
														Vormsi		449.6 *
														Nabala		Johvi †	450 *
													Viru	Rakvere			450.6 *
														Oandu			452 *
			Sandbian											Keila	Idavere †	Ordovician 4	453
														Haljala			453.9
														Kukruse			456.4 *
														Uhaku	Aluoja †		457.5 *
		Middle Ordovician	Darriwilian							Darriwilian	Guniu †/Hulo			Uhaku		Ordovician 3	458.4
														Lasnamagi			458.9 *
														Aseri			460.4 *
													Oeland	Kunda			462.9 *
															Valaste †/Hunderum		464.3 *
											Hunjiang †	Dawan †/Daobaowan/Ningkuo					466.3 *
Volkhov							Langevoja †/Vaana/Saka							467.1 *
Volkhov			Dapingian							Dapingian				Ordovician 2		467.3
Billingen			Dapingian							Dapingian						469.3 *
		Early Ordovician	Floian							Yiyangian						470
							Latorp †								470.1 *
Hunneberg															473.7 *
			Tremadocian							Xinchangian				Ordovician 1	477.7
												Lianghekou †			477.9 *
Varangu															481.3 *
Pakerort															482.2 *
Pakerort	Cambrian	Furongian	Stage 10											Cambrian 5	485.4
															486.3 *
					486.5
			Jiangshanian		489.5
			Paibian		494
		Miaolingian	Guzhangian		Series 3 †								Cambrian 4	497
			Drumian										Cambrian 4	500.5
			Wuliuan										Stage 5 †	Cambrian 3	504.5
		Series 2	Stage 4											Cambrian 3	509
		Series 2	Stage 3											Cambrian 2	514
		Terreneuvian	Stage 2											Cambrian 2	521
		Terreneuvian	Fortunian											Cambrian 1	529
	Proterozoic	Neoproterozoic	Ediacaran													Vendian †	Poundian †	538.8
	Proterozoic	Neoproterozoic	Ediacaran													Vendian †	Wonokan †	571.7 *
																							635